JPH04500992A - Thick material pump with trailing blocking mechanism - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Dense material pump theory with subsequent blocking mechanism The present invention provides for two alternately operated feeds that lead to the material supply container through end-side openings. A feed cylinder provided inside the material supply container and alternately arranged on the inflow side. It is possible to connect to the opening of the A pipe switching device that can be connected to the feed pipe line and a pipe switching device that can be connected to the feed pipeline The present invention relates to a thick material pump having a subsequent blocking mechanism.

This type of pump is used to remove waste rock mixed with water, e.g. when building tunnels, or concrete, such as pulverized coal mixed with water or fuel oil in coal-burning equipment; and other mushy substances. Blocking mechanism in pressure pipe allows high pressures without the risk of backflow of material during switching pipe switching devices. It allows it to operate against force. As a pipe switching device, especially S-shaped A swirl tube bent in this way can be considered. However, in principle, the Also included within the scope of the invention are swivel tubes, tube switching devices and branch tubes.

Additionally, it can be configured as a seat valve, flat slide valve, flapper valve or rotating bell valve, for example. Providing a blocking mechanism in the part of the feed line that can be is known.

The object of the invention is to provide a dense material with a compressible medium to be transported against overpressure. Safety that ensures a reliable functional course of operation even when operating the pump The key is to take measures.

The measure according to the invention provides, in particular, Depending on the differential pressure between the conduit and the pipe switching device, the blocking mechanism is moved from its closed state to the It starts from the concept that it is necessary to be able to reverse the state to the open state. So In the case of It must be possible to switch from the closed state to the open state when a predetermined boost pressure is reached. There is a point.

According to a preferred embodiment of the invention, at the end of the suppression stroke in the feed cylinder and The pipe switching device can be reversed if the pressure medium supply and discharge are not obstructed. The drive means can be operated in the closing direction of the blocking mechanism prior to the After switching the pipe switching device, the drive means can be operated in the direction of opening the blocking mechanism. The blocking mechanism is equipped with a drive hand that can be operated hydraulically or pneumatically so as to The stages can be driven through a sequence control device, in which case the release The pressure medium line for the pressure medium flowing in the direction is provided with an adjustable pressure holding mechanism. It will be done. To ensure that the supply of pressure medium in the closing direction is unimpeded, A pressure retaining mechanism is advantageously bridged by a non-return valve that is open in the direction of inflow.

The pressure retention mechanism can be configured as a pressure limiting valve or a pressure retention valve, for example. Ru. In this regard, the pressure medium pipe for the pressure medium flowing in the opening direction of the blocking mechanism The pressure can also be improved by providing an adjustable pressure retention mechanism.

With one or two pipe switching device reversing cylinders, the pipe switching device reversing cylinder The end of the feed cylinder or its drive cylinder installed in the hydraulic line connected to Another preferred embodiment of the invention includes a pipe switching device reversing valve hydraulically operable by a signal. According to an embodiment, an additional A distribution valve is provided, the distribution valve being removable in the blocked state of the blocking mechanism. It is possible to switch from its blocking state to its flowing state by means of a possible signal. be. Blocking of the blocking mechanism if the blocking mechanism has a hydraulic cylinder as drive means In the hydraulic cylinder, an additional distribution valve can be actuated, especially hydraulically or electrically. A typical termination signal can be extracted.

Furthermore, the pressure medium line connected to the drive means of the blocking mechanism is hydraulically pyrostatically Preferably, a check valve is provided which can be controlled by the pipe switching device. together with the reversing valve, can be driven through a common hydraulic pilot control line, In that case, the pilot control line connected to the reversing valve should be connected to the reversing cylinder of the pipe switching device. A further reversing valve is provided which is operable by the end position signal of the motor. desired sequence pipes connected to the pipe switching device reversing valve and the blocking mechanism reversing valve to obtain The lot control line is controlled by the end position signal of the feed cylinder or its drive cylinder. A distribution valve is provided which can be driven by the

In one preferred embodiment, the blocking mechanism is configured as a seated valve, the valve seat of which is under pressure. The valve head of the seat valve is provided in the flow path of the feed line where the force is applied, and the valve head forms the driving means. It is installed on the piston rod of a hydraulic cylinder that performs dual action. In this case, supercharging is connected to the pressure medium pipe connected to the pipe connection port on the bottom side of the hydraulic cylinder. A check valve that is open toward the Particularly easy to obtain due to the provision of a connected adjustable pressure holding mechanism. It will be done.

Drive cylinder operating the feed cylinder, pipe switching device reversing cylinder and blocking machine The drive means of the structure may be actuated by a common regulating pump by means of a pressure medium. The discharge amount of the regulating pump can be adjusted according to the operating condition by sequence control. It can be adjusted accordingly. Sequence control can also be implemented in two-circuit devices. In this two-circuit device, on the one hand there is a drive cylinder for the feed cylinder; The drive means for the reversing cylinder and blocking mechanism are suitable for various vR valves. controlled by the Also, in free-flow devices using reversible pumps, 1 Sequence control according to the present invention can be implemented.

The invention will now be explained in more detail by means of schematically illustrated embodiments.

The only diagram shows a Nijilinda concentrate with a subsequent blocking mechanism in a two-circuit hydraulic system 1 shows a schematic diagram of a sequence control circuit for a water pump;

The Nijilinda thick material pump essentially consists of two feed cylinders 1.2, which The openings on the end faces of these feed cylinders are connected to the material supply container 3, and the pipe switching The device 4 can be connected alternately to the feed line 5 .

The feed cylinders 1, 2 are driven in a push-pull manner by a hydraulically driven cylinder 6.7. The drive cylinder 6.7 is operated by an adjustable hydraulic pump 102 and a reversing valve 4o. The bottom side is acted on by pressure oil, and the end on the frame side is acted on by the cross vibe 8. are hydraulically connected to each other. To compensate for the reciprocating stroke, the drive cylinder At each end of 7, one pressure bridge bridges the drive piston and is equipped with a check valve. A balance line 9 is provided.

The adjustment pump 102 sucks pressure oil from the tank 104 and pumps it through the filter 103. Inhale. High pressure is protected by safety valve 7o. After the pressure oil passes through the safety valve 70, The main slide valve 40 is reached through the check valve 41, and the main slide valve 40 receives high pressure, respectively. Pilot control leads to cylinders 6 and 7. Pipe switching equipment in feed pipe line 5 Behind the station 4 there is a blocking mechanism 83, which in the illustrated embodiment is configured as a seat valve. , this mechanism prevents passage into the subsequent feed area 84 in the closed state.

Blocking mechanism 83 is driven by hydraulic cylinder 82 .

For this purpose, the valve head 83 is provided on the end face of the projection on the piston rod of the hydraulic cylinder. Provided at the end of the side. In the illustrated embodiment, the hydraulic cylinder 8 of the pipe switching device 4 2 and reversing cylinders 71, 72 are supplied with pressure oil by an auxiliary pump 106. It will be done. Similarly, single-circuit configurations with main oil pumps, and pressure medium for individual loads The use of reversible pumps to act on the This is possible without any qualitative changes.

Sequence control will be explained in more detail by describing a reversal cycle.

At the end of the suppression stroke of the feed cylinder 1, the piston of the drive cylinder 6 hits the pyrotron on the frame side. reaches the stop valve 13, which generates a hydraulic pulse, which is applied by a spring. Electro-hydraulic locking via a centrally positioned distribution valve 5° in the rest position. is guided to the pilot control section of the distributing valve 1o which is to be operated. The high pressure of the pump 106 Valves 10 and 14' are connected to each other through connection points 14 and 14' separated from each other by non-return valves. and reaches 61. The end position signal of the pilot valve 13 causes the valve 1o to move to the position shown in the figure. It is activated at the position. Therefore, the high pressure is caused by the pilot control of the pipe switch reversing valve 30. The pyrotron of the reversing valve 8o is reached through the valve 9° and the control unit 81. reaches the cut control section. Valve 3o and valve 80 are therefore reversed.

However, the distributor valve 61 is still prevented from being centeredly positioned by the spring. Because of this position, hydraulic pressure is not yet acting on the pipe switching device reversing valve 30.

The pipe switching device 4 therefore remains temporarily in its conventional state. on the other hand and the valve 8o is simultaneously reversed, thereby applying pressure to the bottom side of the hydraulic drive cylinder 82. A force is applied so that the drive cylinder 82 is operated in the closing direction of the blocking mechanism 83. It will be done. Obstructed by check valve 92 opened to hydraulic cylinder 82 The inflow of pressure medium takes place. In the closed position of the blocking mechanism 83, the output side is A hydraulic cylinder is connected to another pilot valve 15 connected to the pilot control section of valve 61. 82 pistons reach. By actuation of valve 61, all pressure oil is removed from connection point 14. Both pipe switching devices are connected through the pipe switching reversing valve 30 which can now pass through. It flows freely into the reversing cylinders 71,72. When the final position of the pipe switching device 4 is Removal device through conduits 73 and 74 in reversing cylinders 71 and 72 It will be done. From there, the end position signal reaches the pilot control of valve 90 and thus Valve 90 reverses the pilot control of valve 80 and on that side from connection point 14' Opening pressure on the frame side is applied to the hydraulic cylinder 82. In addition, the end position signal 73 or 74 and the pilot control section of the main slide valve 40 via the operating mechanism valve 20. is supplied to This reverses the supply pressure in the drive cylinder 6.7. . In the embodiment described above, the cylinder 7 is pressurized on the bottom side and is therefore The feed cylinder 2 performs reciprocating motion due to pressure.

The pressurized feed cylinder 2 transfers the material to the blocking mechanism which is still in the closed state. 83 via the pipe switching device 4. Supply line section behind the blocking mechanism At minute 84, overpressure can be controlled by action of the process. difference Furthermore, in this case the blocking mechanism 83 needs to open against this pressure. this is, First, on the frame side, it acts on the piston of the drive cylinder 82 of the blocking mechanism to open the pressure limiting valve. This is done by hydraulic pressure adjustable by 42. This force is controlled by an adjustable pressure control. Limiting valve 91 counteracts the prestressed bottom oil condition. Pressure limiting valve 42 and 91 by a corresponding adjustment of the counterbalancing force acting on the blocking mechanism 83. can be adjusted to the desired degree of pre-concentration.

By pre-concentrating, an overpressure condition is created when the blocking mechanism 83 is opened. It is ensured that no backflow occurs from certain areas 84.

At the end position of the drive cylinder 6 and at the bottom suppressed position of the drive cylinder 82, By taking a signal in the supply line to the cylinder 82, the valve 66 is controlled to operate. and the safety valve 70 is released. Therefore, the main oil flow from pump 102 is obstructed. can flow into the tank without being contaminated. When the blocking mechanism 83 is released, the valve 6 6 is released again. The disadvantage of this device is that, especially when reversing, oil drains from the main pump. This means that the information flows without being used by others. With corresponding precautions, the main feed pump It is also possible to return the feed amount 102 to zero during the reversal time.

Drive cylinder 6.7, tube switching device reversing cylinder 71.72 and hydraulic cylinder 82 end position signals by adapted sensors or proximity switches el, e2. e3゜ Electrically taken out by e4 and e5, distribution valve 10 (el, , e2) or 90 (e3, e4) and for driving the main oil pump 102 (e5). can be done.

Valves 20 and 50 are advantageously mechanically coupled to each other. At valve 20 The operating functions can be manually set to zero, forward and reverse. reverse feed At the same time, the valve 50 is activated. Operation function valve as shown in the figure 20 is electrically driven, valve 50 is also electrically driven in the reverse feed state. It will be done.

During normal operation of the device, voltage is supplied to the control unit 81 via the connecting conductor 86. be provided. Control leads 87°89 and 87', 89'' are connected to the supply voltage. Ru. In a no-voltage state, for example, in an emergency shutoff, the blocking mechanism 83 closes the bottom of the cylinder 82. It needs to be ensured that it is closed by side action. Therefore, The control unit 81 is reliably connected to the conductors 88, 89 even when the pressure Regardless of the connection state at the time, the bottom side of the cylinder 82 is actuated by pressure oil to prevent It is necessary to close the structure 83. At the same time, in that case conductor 89' It is connected to the pulse conductor 88'. via check valve 110 by pump 106 The accumulator 111, which can be supplied with pressurized oil, is In an emergency, the oil reserve in the accumulator 111 closes the blocking mechanism 83. I guarantee it.

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Claims (1)

[Claims] 1. Two feed cylinders that operate alternately lead to the material supply container through an opening on the end side. The feed cylinder is installed inside the material supply container and alternately opens the feed cylinder on the inflow side. It is possible to connect to the opening of each other and open the other opening on the outflow side. A pipe switching device that can be connected to the feed pipe line and a pipe switching device installed after the pipe switching device when viewed in the feeding direction. In a dense material pump having a blocking mechanism, between the feed line and the pipe switching device, adjustable by hydraulic or pneumatic means; The blocking mechanism (83) is reversed from its closed state to its open state in response to a differential pressure of A thick material pump characterized by being able to 2. When a predetermined boost pressure in the pipe switching device is reached, the blocking mechanism (83) Concentrated material according to claim 1, characterized in that it can be reversed from a closed state to an open state. pump. 3. At the end of the pressing stroke in the feed cylinders (1, 2) and during the supply of pressure medium. and before the pipe switching device (4) is reversed with unobstructed discharge, the drive hand The stage (82) can be operated in the closing direction of the blocking mechanism (83), following which the tube After switching the switching device (4), the drive means (82) is switched to the opening direction of the blocking mechanism (83). The blocking mechanism (83) is hydraulically or pneumatically operated so that it can be operated in the opposite direction. by means of a drive means (82) which can be operated by a sequence control device. pressure medium pipes for the pressure medium flowing out in the opening direction. Claim characterized in that the channel is provided with an adjustable pressure retention mechanism (91). The concentrated material pump according to 1 or 2. 4. The pressure holding mechanism (91) is bridged by the check valve (92) that opens in the inflow direction. The thick material pump according to claim 3, characterized in that: 5. The pressure holding mechanism may be configured as a pressure limiting valve (91) or a pressure holding valve. The thick material pump according to claim 3 or 4, characterized in that: 6. In the hydraulic pipe line connected to the pipe switching device reversing cylinder (71, 72), an additional A distribution valve (61) is provided, which distributes when the blocking mechanism (83) is in the blocking state. The signal (15), which can be extracted by one or two pipe switching devices, characterized in that they can be switched to the state An oil pipe equipped with reversing cylinders (71, 72) and connected to the reversing cylinder of the pipe switching device. Feed cylinders (1, 2) or their driving cylinders (6, 7) installed in the pressure pipeline Pipe switching device reversing valve (3) hydraulically operable by end position signals (12, 13) of 6. A thick material pump according to any one of claims 1 to 5, comprising: 0). 7. The blocking mechanism (83) has a hydraulic cylinder (32) as a driving means, and In the hydraulic cylinder (82) in the blocked state of the mechanism (83), an additional distribution actuating the valve (61) and taking out, in particular, a hydraulic or electrical end position signal (15); 7. A thick material pump according to claim 6, characterized in that it is capable of 8. The pressure medium line connected to the drive means (82) of the blocking mechanism (83) is provided with hydraulic pressure. A pilot-controllable reversing valve (80) is therefore provided, and a blocking reversing valve (80) and and pipe switching device reversing valve (30) are hydraulically pilot-controlled via a common pipe line. possible, in which case a pilot control pipe connected to the blocking mechanism reversing valve (80) according to the end position signals (73, 74) of the pipe switching reversing cylinders (71, 72). Claim 6 characterized in that a further reversing valve (90) is provided which can be operated by or the thick material pump described in 7. 9. The pipe connected to the pipe switching device reversing valve (30) and the blocking mechanism reversing valve (80) The pilot control line is connected to the feed cylinder (1, 2) or its drive cylinder (6, 7). ) is provided with a distribution valve (10) that can be driven by a terminal position signal of 9. The thick material pump of claim 8. 10. Particularly electrically operable control unit used as emergency cut-off block (81) is provided, and during its normal operation, the blocking mechanism valve and the control valve (80) are separated. It can be pilot controlled by the reversing valve (90) of the The drive means (82) of the blocking mechanism (83) is then actuated into the closed state by pressure. Thick material pump according to claim 8 or 9, characterized in that: 11. It is possible to operate the drive means (82) of the blocking mechanism (83) in the closing direction. 11. Concentrated device according to claim 10, characterized in that it comprises an accumulator (111) of material pump. 12. The blocking mechanism (83) is configured as a seated valve, the valve seat of which is under pressure. The seat valve is provided in the flow path of the feed pipe (5, 84), and the valve head of the seat valve is connected to the drive means (8). 2) is installed on the piston rod of a hydraulic cylinder that performs dual action. A hydraulic cylinder (82) is connected to the pressure medium pipe line connected to the pipe connection port on the bottom side of the cylinder (82). ), and the check valve (92) is connected parallel to this and the inlet side is the hydraulic system. An adjustable pressure holding mechanism (91) connected to the cylinder (82) is provided. The concentrated material pot according to any one of claims 4 to 11, characterized in that: pump. 13. Drive cylinders (6, 7) that operate the feed cylinders (1, 2), pipe switching equipment The position/reversal cylinders (71, 72) and the drive means (82) for the blocking mechanism are connected to a pressure medium. Can be operated by a common regulating pump by the body, regulating pump discharge volume can be adjusted according to the operating condition, which can be adjusted by sequence control. Thick material pump according to any one of claims 1 to 12, characterized in that 14. Pressure medium flowing in the opening direction of the blocking mechanism (83) in the drive means (82) The pressure medium line for the body is provided with an adjustable pressure holding mechanism (42), in particular a pressure limit or Any one of claims 3 to 13, characterized in that a pressure holding valve is provided. Thick material pumps as described in Section.